Simply a simple game with a pretty high buzz factor. Simple supplies: people,
beer, deck o' cards.
One player goes first. Using mental telepathy, s/he tries to predict the color
of the card about to be turned over. If correct, s/he continues; if incorrect -
drink.
If correct three times in a row, the player can make a rule concerning procedure
for the game. Interesting rules are:
"Can't say red"
"Can't say black"
"Tap head before drinking", etc.
As always, be creative.
Of course, if someone is caught "violating" a rule, s/he drinks. But
be sure not to break the rules while enforcing them.